Precise drilling and countersinking in one operation thanks to adjustable drilling and countersink depth. The freely rotating depth stop prevents damage to the material surface. The countersink depth can be individually adjusted for different screw heads. The drill can be replaced if necessary. The drill countersink brings speed to terrace construction: it allows for drilling and countersinking of terrace boards and substructures in just one step. It is flexible to use due to the adjustable drilling depth and extremely durable thanks to the long service life of the special drill. For quick changes between different applications, the drill countersink is compatible with the entire Festool CENTROTEC system.